The four richest men in Indonesia own as much wealth as the country’s poorest 100 million citizens, despite the nation’s president repeatedly pledging to fighting “dangerous” levels of inequality.

Oxfam on Thursday highlighted Indonesia as one of the most unequal countries in the world, where the number of dollar billionaires has increased from one in 2002 to 20 in 2016.

The development charity worked out that the four richest Indonesians – led by brothers Budi and Michael Hartono – control $25bn of assets, which is roughly equal to the wealth of the poorest 40% of Indonesia’s 250 million population. The charity said the Hartonos – who own a clove cigarette company – could earn enough interest on their fortune in a year to eradicate extreme poverty in Indonesia.